Hi
More than likely that white stuff growing is Mold, probably because they do not run a humidifier like you do, there is some more investigating here that needs to be done, First things first why is the basement wet and then go from there, maybe contact a dry basement contractor to have them troubleshoot yours, more than likely it would be the same reason next door. With that mold I would want to check the rest of the house as well especially all around the basement the floor joists for the first floor the walls int eh first floor everything. that could be extremely costly. Again, if it is the early stages of mold
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